1 files changed, 42 insertions, 0 deletions
diff --git a/pint/facets/measurement/registry.py b/pint/facets/measurement/registry.py
new file mode 100644
index 0000000..77bde3d
--- /dev/null
+++ b/pint/facets/measurement/registry.py
@@ -0,0 +1,42 @@
+"""
+    pint.facets.measurement.objects
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    :copyright: 2022 by Pint Authors, see AUTHORS for more details.
+    :license: BSD, see LICENSE for more details.
+"""
+
+
+from __future__ import annotations
+
+from ...compat import ufloat
+from ...util import build_dependent_class, create_class_with_registry
+from .objects import Measurement, MeasurementQuantity
+
+
+class MeasurementRegistry:
+
+    _quantity_class = MeasurementQuantity
+    _measurement_class = Measurement
+
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__()
+
+        cls.Measurement = build_dependent_class(
+            cls, "Measurement", "_measurement_class"
+        )
+
+    def _init_dynamic_classes(self) -> None:
+        """Generate subclasses on the fly and attach them to self"""
+        super()._init_dynamic_classes()
+
+        if ufloat is not None:
+            self.Measurement = create_class_with_registry(self, self.Measurement)
+        else:
+
+            def no_uncertainties(*args, **kwargs):
+                raise RuntimeError(
+                    "Pint requires the 'uncertainties' package to create a Measurement object."
+                )
+
+            self.Measurement = no_uncertainties